“Such dwellers on earth wondered admiringly at the revived scarlet wild beast. Much reliance was placed in its ability to be a power for world peace and security. Great expectations were held out for it, and it was given designations that were really blasphemous from the standpoint of the Holy Bible. How so? In that to this wild beast powers were ascribed and tasks were assigned that really belong to Gods kingdom and its Messiah or its Christ. Back in 1919 the scarlet League of Nations had been seriously called the political expression of the Kingdom of God on earth. And now the United Nations, the successor of that League, has been called the best means for peace, yes, even more than that, the last hope for peace. So today we can see in actuality what the apostle John saw in symbol, that that scarlet-colored wild beast is full of blasphemous names. Those expressions of admiration for it turn false religionists, not to the worship of Jehovah God the Creator, but to idolatry of a man-made creation, the worship of a political image, the worship of an international organization for world peace and security.Rev. 17:3.” Watchtower 1963 Nov 15 p.697

“The United Nations is actually a worldly confederacy against Jehovah God and his dedicated Witnesses on earth.” Watchtower 1987 Sep 1 p.20

As late as the 1991 June 1 p.17 issue of the Watchtower, Christendom was condemned for its involvement with the United Nations

If Christendom had sought peace with Jehovahs King, Jesus Christ, then she would have avoided the coming flash flood.Compare Luke 19:42-44. 10 However, she has not done so. Instead, in her quest for peace and security, she insinuates herself into the favor of the political leaders of the nations this despite the Bibles warning that friendship with the world isenmity with God. (James 4:4) Moreover, in 1919 she strongly advocated the League of Nations as mans best hope for peace. Since 1945 she has put her hope in the United Nations. (Compare Revelation 17:3, 11.) How extensive is her involvement with this organization? 11 A recent book gives an idea when it states: No less than twenty-four Catholic organizations are represented at the UN. Several of the worlds religious leaders have visited the international organization. Most memorable were the visits of His Holiness Pope Paul VI during the General Assembly in 1965 and of Pope John Paul II in 1979. Many religions have special invocations, prayers, hymns and services for the United Nations. The most important examples are those of the Catholic, the Unitarian-Universalist, the Baptist and the Bahai faiths.

True, the 138 members of the United Nations organization know that Jehovahs Christian witnesses are no part of Christendom, no, no part of harlotrous Babylon the Great as a whole. They know that Jehovahs witnesses have not messed themselves up with the dirty politics of this world and have not tried to ride the symbolic scarlet-colored wild beast having seven heads and ten horns. Mans Salvation out of World Distress at Hand! (1975) pp.339-340

Human governments have schemed to form the most brazen and defiant conspiracy against divine rule that has ever existed. (Compare Isaiah 8:11-13.) They have done so, not once, but twice, creating first the League of Nations and then the United Nations. Awake! 1990 Dec 8 p.24

It was somewhat surprising when in the 1990s a number of complimentary articles were written praising the work of the United Nations.

THE preamble to the United Nations Charter expresses these noble aims: …Did the UN accomplish these aims? Did it get the nations to unite their strength and maintain peace and security? No, not so far, although the UN has sincerely tried to be a significantly better way than the League of Nations.Jehovahs Witnesses firmly believe that the United Nations is going to play a major role in world events in the very near future. No doubt these developments will be very exciting. And the results will have a far-reaching impact on your life. We urge you to ask Jehovahs Witnesses in your neighborhood for more details on this matter. The Bible clearly paints a picture showing that the United Nations will very shortly be given power and authority. The UN will then do some very astonishing things that may well amaze you. And you will be thrilled to learn that there is yet a better way near at hand that will surely bring eternal peace and security! Awake!1991 Sep 8 p.10

Seeing as you are unwilling (or not allowed) to do your own research these are just a few to get you started.